added CONFIG_CRYPTO_HASH_INFO check.

fixes missing hash_algo_name symbol

src/Makefile

@@ -4,6 +4,7 @@ KERNEL_DIR := ${MODULES_DIR}/build
 
 obj-m += xt_ts3init.o
 xt_ts3init-objs += ts3init_module.o ts3init_match.o ts3init_cookie.o ts3init_target.o ts3init_cache.o siphash24.o
+ccflags-$(CONFIG_CRYPTO_HASH_INFO) += -DHAS_CRYPTO_HASH_INFO=1
 
 all:
 	$(MAKE) -C ${KERNEL_DIR} M=$$PWD;

src/ts3init_cookie.c

@@ -26,7 +26,7 @@
 #include "ts3init_random_seed.h"
 #include "ts3init_cookie.h"
 
-#if LINUX_VERSION_CODE < KERNEL_VERSION(3, 13, 0)
+#ifndef HAS_CRYPTO_HASH_INFO
 #define TS3_SHA_512_NAME "sha512"
 #else
 #include <crypto/hash_info.h>